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Significant accounting policies (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
Buildings Member | Bottom of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 15 years
Buildings Member | Top of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 25 years
Plant and equipment [member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 3 years
Plant and equipment [member] | Top of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 15 years
Furniture and fixtures [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 3 years
Furniture and fixtures [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 10 years
Other [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 3 years
Other [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment [Line Items]  
Estimated useful lives 5 years